Building-block.



UNITED STATES Y IJ/U/7 Examiner PATENT OFFICE.

ANGELIKA CZEPULL, OF LANCASTER, PENNSYLVANIA, ASSIGNOR OF ONE- 1 THIRDTO PAUL HEINE, OF SAME PLACE.

BUILDING-BLOCK.

SPECIFICATION forming part of Letters Patent No. 675,374, dated June 4,1901. Application filed March 28, 1901. Serial No. 53,193. (No s e imenby weight, crushed furna five parts, byvveiqht slalzed lime' two parts,by weight, 15 Portland cement? one part, by weight sum an one parbyweigh salt. The sa 1s dlssolved in water and the s a e lime, thecement,- the slag, and the plaster-of-paris are successively added andthoroughly stirred in. 2: After the mixture is completed the mass is NOI'fe fences molded into blocks of suitable size and is airdried. 7"

The sodium chlorid ,in the mixture acts upon the lime and upon thesilicates of the slag and cement. Thus silicic acid is formed, which inturn acts upon a further quantity of the lime, forming calcium silicate.This calcium silicate hardens the mass rapidly in the presence of water,so that in this way a block of superior strength is produced.

What I claim is' A building-block composed of slag, lime, cement, gypsumand salt, substantially as specified.

Signed by me at Lancaster city, Pennsylvania, this 22d day of March,1901.

ANGELIKA CZEPULL.

Witnesses:

HARVEY B. LUTZ, PAUL HEINE.

